CEO Andrew Mackenzie said it was too early to say what impact the recent Vale tailings dam disaster will have on efforts to restart BHP and Vale's jointly owned Samarco mine, shut since November 2015 after a dam collapse killed 19 people.
While South Africa has suffered electricity shortages for more than a decade, the utility is at a crisis point and is seen as the biggest threat to the economy.
The company said it failed to reach an agreement with a client in a dispute over a mining project in Latin America, prompting it to slash its profit forecast by more than 40% for the year.
To boost coal use in the US: Find a spot near a mine with no access to oil or natural gas pipelines, where it’s not particularly windy and it’s dark much of the year.